How do I start streaming music?

I am considering joining the 21st century and streaming music at home. Where and how do I start? I do not have a smart phone. I have a computer obviously.
My preamp (McIntosh C47) has a lot of inputs, including a USB port. Is there a device that can plug into one of the ports and stream wireless from my computer? Is that a preferred method?
Any and all advice is welcomed and thanks in advance.

Have a look at Chromecast Audio which is a small device that plugs into your hifi using RCA phono inputs. Once set up this communicates with a router via wifi & any music-playing device connected to the same network can play its files on the hifi. I have one & play music files on my desktop (wired to the wifi router) to my hifi on the other side of the room using wifi.

I am thinking of subscribing to a service through my computer. I don't want to listen on the cheap computer speakers, though, it needs to be somehow connected to my main system. Sending a cable from the computer to the pre is not something i want to do, as they are far apart but still in the same room.
Thanks for the links I will take a look now.

Order an Echo Dot from Amazon. They will preconfigure it to your Amazon account, so you can finish setting it up via a browser on your PC. Thousands of stations, several services, plus your own music via voice control with the right skills enabled. It plugs into your amp via 3.5mm to RCA cable.

A 3.5mm to RCA cable.You likely have several of them lying around. Or you can buy from Monoprice cheap (or Amazon, etc.) -- as long as 50 feet. Plug the single end into your computer, speakers out, and the double into a pair of available RCA ins on your preamp.

Then go here and set up a free Spotify account: https://www.spotify.com/us/. The free service is lower quality and has commercials, but it's free. You can always upgrade later if you like it.